Honeywell T8000C Programmable Thermostat Installation Instruction

Honeywell T8000C Programmable Thermostat

APPLICATION

The T8000C Thermostat provides a single-stage, programmable temperature control for 24 Vac heating-cooling systems with the manual changeover from heat to cool. The heating cycle rate is selectable at 1, 3, 4, 5, 6, 9, or 12 cph. The cooling cycle rate is fixed at 3 cph. Temperature the indication can be set for °F or °C. The T8000C Thermostat is powered through the heating/\ cooling system controls. Batteries are not required because setpoints are held permanently by non-volatile memory. The T8000C model includes a thermostat, wallplate, and owner’s guide. A 7-3/8 in. (188 mm) x 5-3/4 in. (146 mm) decorator cover plate (for covering wall marks) is available separately. Order Honeywell part no. 209649A (taupe) or part no. 209649B (white).

MERCURY NOTICE
If this control is replacing a control that contains mercury in a sealed tube, do not place your old control in the trash. Dispose of it properly. Contact your local waste management authority for instructions regarding recycling and the proper disposal of a control.

INSTALLATION

When Installing this Product…

1. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition.
2. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application.
3. Installer must be a trained, experienced service technician.
4. After installation is complete, check out product operation as provided in these instructions.

CAUTION
Hazardous Voltage. Can damage the heating/cooling system. Disconnect power at the furnace or main breaker/fuse box.

Location
Install the thermostat about 5 ft (1.5m) above the floor in an area with good air circulation at an average temperature. See Fig. 1. Do not install the thermostat where it can be affected by:

• drafts or dead spots behind doors and in corners.
• hot or cold air from ducts.
• radiant heat from the sun or appliances.
• concealed pipes and chimneys.
• unheated (uncooled) areas such as an outside wall behind the thermostat.

Table 1. Description of T8000C Thermostats

Model	System	Changeover	System Selection	Fan Selection	Powering Method
T8000C	Heat-Cool	Manual	Cool-Off-Heat	Auto-On	Power Stealing

Mounting Wallplate to Wall

IMPORTANT
The level is only for appearance. The thermostat functions normally even when not level. Mount the wallplate and the T8000C with the screws provided (see Fig. 2) as follows:

1. Place the wallplate at the desired location on the wall
2. Pull the thermostat wire through the wallplate entrance hole.
3. Fasten the wallplate to the wall using the anchors and screws provided.
4. After wiring the wallplate, plug the hole with nonflammable insulation to prevent drafts from affecting the thermostat; see the Wiring section.

Wiring
IMPORTANT
Use an 18-gauge maximum wire for wiring the T8000C Thermostat.

All wiring must comply with local electrical codes and ordinances. Disconnect the power supply to prevent electrical shock or equipment damage. The shape of the terminals permits the insertion of straight or
wraparound wiring connections; either method is acceptable. A letter code is located near each terminal for identification. See Fig. 3.
NOTE: To ensure proper mounting of the thermostat, restrict all wiring to the shaded area in the center of the terminals. See Fig. 4.

 

The T8000C Thermostat is powered through the heating/ cooling system controls and is adaptable to most 18 to 3  Vac heating-cooling systems. Refer to Fig. 5, 6, and 7 for typical wiring hookups.

1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
2. PROTECTION AS REQUIRED.
3. CAN BE USED FOR CHANGEOVER VALVES ON SINGLE-STAGE HEAT PUMP SYSTEMS. JUMPER R TO Rc.
   1. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
   2. REMOVE JUMPER RC TO R WHEN INSTALLED ON A TWO-TRANSFORMER SYSTEM.
   3. CAN BE USED FOR CHANGEOVER VALVES ON SINGLE-STAGE HEAT PUMP SYSTEMS.
   4. POWER TO THE R TERMINAL IS REQUIRED WHEN THE SYSTEM SWITCH IS IN THE OFF POSITION.

Setting Fan Operation (Fuel) Switch

The fan operation (fuel) switch is preset at the factory in the F position. See Fig. 8. This is the correct setting for most systems. If this system is an electric heat system, set the switch to the E position. The E setting allows the fan to turn on immediately with the heating or cooling equipment in a system where the G terminal is connected.

Mounting Thermostat to Wallplate

1. Slide the SYSTEM switch to the Off position.
2. Engage the tabs at the top of the thermostat and wallplate.
3. Swing down the thermostat and press the lower edge of the thermostat onto the wallplate to latch. See Fig. 9

Installer Setup
Setting °F/°C Indication and Heat Cycle Rate The following instructions provide the information necessary to change the heating cycle rate to match the heating equipment and to choose either Fahrenheit (°F) or Celsius (°C) display.
NOTE: All four steps must be completed to save changes to the °F/°C indication and the heat cycle rate.

1. Enter Installer Setup
   • Use ▲ or ▼ keys to set the temperature setpoint to 52°F (11°C).
   • Press the ▲  ▼ keys simultaneously for more than two seconds to enter Installer Setup.
   • Release the keys to display the three-digit software revision code.
   • Press the ▲ key. FC (factory configuration) is displayed. (A typical example is shown, but the information displayed varies by model. This information is for factory use only.)

Optional System Checkout
When in steps 1c and 1d only, the ▼ key can be pressed to turn the heat or cool outputs on and off. Change the SYSTEM switch set to test heat or cool outputs. No action takes place if the SYSTEM switch is in the Off position.

Examples: System setting at Heat: If heat is on, pressing the ▼ key turns it off; if the heat is off, pressing the ▼ key turns it on. System setting at Cool: If cool is on, pressing the ▼ key turns it off; if cool is off, pressing the ▼ key turns it on. The five-minute minimum off time is bypassed.
NOTE: In Installer Setup only, each press of the ▲ key momentarily displays 1. Each press of the ▼ key momentarily displays 2. When the keys are released, these one-digit codes are no longer displayed

Setting °C or °F.

• Press the ▲ key again to display the current setting.
• Press the ▼ key to change the °C o  °F indication.

Setting Heat Cycle Rate (see Table 2 for the cycle rate options and equipment)

• Press the ▲ key to display the current heat cycle rate the setting of 1, 3, 4, 5, 6, 9, or 12 cups. If the desired cycle rate is displayed, Press the ▲ key to exit the installer setup.
• To change the heat cycle rate, Press the ▼ key until your choice of 1, 3, 4, 5, 6, 9, or 12 is displayed.
• Press the ▲ key to display the cooling algorithm configuration default.
• Press the ▲ key again to change the cooling algorithm to C1 or C3. C1 = Standard cooling algorithm. C3 = Aggressive cooling algorithm (can cause overshooting).
• Press the ▲ key again. Current configuration (CC) is displayed. A typical example is shown, but CC varies by model. (This information is for factory use only).

Exit Installer Setup

• Press the ▲ key to save all changes and return to normal operation

Table 2. Heating Cycle Rate

System	Cycles Per Hour
Steam, Gravity	1
Hydronic Heat, Condensing Gas Furnacesa	3
Gas or Oil Forced Air	6
Electric Heat	9
Special Applicationsb	4, 5, 12

Operation

Setting FAN and SYSTEM Switches
Fan and system settings are controlled manually by using the switches located at the bottom of the thermostat case. See Fig. 10.

FAN Switch
Fan switch settings are:On: The fan runs continuously. Use for improved air circulation and air quality. Auto: Normal setting for most homes. In cooling, the fan starts and stops with the cooling equipment. In heating, the fan is controlled directly by the heating equipment and may start a few minutes after the heating equipment turns on (most systems). When the fan operation (fuel) switch is in the E position, the fan starts and stops with the heating equipment. Slide the FAN switch in the lower-left corner of the thermostat to select the desired fan setting.

SYSTEM Switch
System switch settings control thermostat operation as follows: Cool: The thermostat controls the cooling system. Off: Both heating and cooling are off. Heat: The thermostat controls the heating system. Slide the SYSTEM switch in the lower right corner of the thermostat to select the desired system setting.

 

Setting Current Time and Day

1. To Set Current Time.
   • Press Select twice.
   • Press ▲ or ▼ to set the current time.
2. To Set Day of Week.
   • Press Select again.
   • Press ▲ or ▼ to set current day

To use the preprogrammed time and temperature (see Table 3), press Hold to exit the programming mode.

Setting Time and Temperature
The T8000C is preprogrammed with the time and temperature settings shown in Table 3. For instructions on programming the thermostat refer to the Owners Guide, form no. 69-1143.

Table 3. Preprogrammed Time and Temperature Settings

Period	Time	Heat Setpoint	Cool Setpoint
Wake	6:00 AM	70°F (21°C)	78°F (26°C)
Leave	8:00 AM	62°F (17°C)	85°F (29°C)
CRHetEurCn	KO6U:0T0 PM	70°F (21°C)	78°F (27°C)
Sleep	10:00 PM	62°F (17°C)	82°F (28°C)

CHECKOUT
Heating

1. Slide the SYSTEM switch to Heat and the FAN switch to Auto.
2. Press and hold the ▲ key to raise the temperature setting several degrees above the room temperature; the heating equipment should start. In conventional systems, the system turns on the fan through the use of a time delay relay or through limit control. When the fan operation (fuel) switch is in the E position, the fan starts immediately.
3. Press the ▼ key to lower the temperature setting below room temperature. The heating equipment should stop.

Cooling

Damage To Compressor Possible. Operating at too low of an outdoor temperature may cause compressor damage. Do not operate the cooling if the outdoor temperature is below 50°F (10°C). Allow the compressor to remain off for five minutes before restarting. Refer to the manufacturer’s recommendations.

1. Slide the SYSTEM switch to Cool and the FAN switch to Auto.
2. Press the ▼ key to lower the temperature setting several degrees below the room temperature; the cooling equipment should start. The fan starts and stops with the cooling equipment. NOTE: If the cooling system does not start immediately, remember that the thermostat has a built-in minimum off-time of five minutes to protect the compressor.
3. Press the ▲ key to raise the temperature setting above room temperature. The cooling system should shut down.

Fan

1. Slide the SYSTEM switch to Off and the FAN switch to On. The fan should run continuously.
2. controlled directly by the heating equipment and may start a few minutes after the heating equipment turns on (on most systems). When the fan operation (fuel) switch is in the E position, the fan starts and
   stops with the heating equipment. In cooling, the fan starts and stops with the cooling equipment. Make certain all equipment responds correctly to the thermostat.

Automation and Control Solutions
Honeywell
1985 Douglas Drive North
Golden Valley, MN 55422
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Scarborough, Ontario
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REFERENCE:

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Honeywell T8000C Programmable Thermostat Installation Instruction

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Honeywell T8000C Programmable Thermostat Owner Guide

Honeywell T8000C Programmable Thermostat Installation Instruction